Automatic door-operating appliance.



M. HYNEK.

AUTOMATIC DOOR OPERATING APPLIANUB. APPLIoATIoN FILED ooT.1o. 1911,

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COLUMBIA PLANnuRAPH C0.. WASHINGTGN. D. C,

MAX HYNEK, 0F RIESA-ON-THE-ELBE, GERMANY.

AUTOMATIC DOOR-OPERATING APPLIANCE.

Specification of Letters Patent.

Application filed October 10, 1911.

Patented May 21, 1912.

serial No. 653,798.

To all whom it may concern:

Be it known that I, MAX HYNEK, a subject of the Emperor of Germany, anda resident of Riesa-on-the-Elbe, Germany, have invented a certainImproved Automatic Door-Operating Appliance, of which the following is aspecification.

The present invention relates to a door operating-appliance of the kindconnected to a movable foot-board so as to open automatically when thelatter is trod on and reclose as soon as the board is relieved of theweight.

The invention consists in the construction ,and combination of parts ashereinafter described and claimed in reference to the accompanyingdrawings of which- Figure 1 represents a front view of the arrangement,Fig. Q, a plan of the same, and Fig. 3, a cross-section.

The apparatus consists in the first place of two double-armed levers 4which turn vertically in diiferent planes about pivots arranged at somedistance apart one above the other. One end of each lever is connectedby means of a pivot 2 to one side of the door 1. The latter is carriedby the levers which have their opposite ends connected by a weightedelement 5 which balances the weight of the door. The lower lever 4 has-ashort arm 6 connected to its center at right angles, which arm is linkedby means of a connecting rod 7 toa doublearmed lever 8. To balance theweight of the latter elements a counter-weight 9 is provided which ismounted on an arm connected to the lever 4 opposite the arm 6 andcarried in the opposite direction. The free end of the lever 8 iscomparatively short and has a forked formation in which is mounted aroller 10. This roller, and with it the end of the lever, is supportedin a cradle actuated by springs 11 which tend to hold the elements inthe position indicated in full lines in Fig. 1. A gap is made in thefloor at both sides of the door 1, under which the roller 10 isdisposed, the removed art of the floor being substituted by two aps 13lwhich are controlled by hinges 14. Each flap carries at its free end aroller 12 by means of which it is supported on the roller 10 as shown inFig. 3. The elements are exactly balanced by the weights 5 and 9, andthe pressure of the springs 11 is only just sufficient for maintainingsaid elements with the door in closed position.

The modus operandi is as follows: If one of the flaps 13 is trod on, thepressure of the springs 11 is overcome and the lever 8 turned about itspivot. The long arm of said lever then acts by means of the link 7 onthe arm 6 so as to reverse the position of the levers 4, the door 1being thereby raised and carried in its own plane, about the pivots ofthe levers, into the position indicated by dotted lines in Fig. 1. Assoon as the flaps 13 are relieved of the weight, the springs 11 restorethe elements to their normal position, thus re-closing the door.

It is evident that the arrangement may be doubled so as to cause the twoparts of a double door to open in opposite directions.

I claim:

An automatic door operating-appliance of the character described,comprising two pivoted double-armed levers carrying the door with oneend, a weighted element connected to the opposite ends of the levers soas to balance the door, hinged flaps adjoining the floor at oppositesides of the door, a double* armed lever supporting the free ends ofsaid flaps with one arm, connections between the other arm of thesupporting lever and the door carrying-levers so arranged as to causethe latter levers to be turned for moving the door in its own plane intoopen position when the iiaps are trod on, and springs acting on saidsupporting lever so as to restore the elementsto their normal positionand reclose the door when the flaps are relieved of the weight,substantially as set forth.

MAX I-IYNEK.

Witnesses Emmi-IARD LORENZ, PAUL ARRAS.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

